1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Mapping of TPMI power domains CPU mapping 4 * 5 * Copyright (c) 2024, Intel Corporation. 6 */ 7 8 #include <linux/bitfield.h> 9 #include <linux/cleanup.h> 10 #include <linux/cpuhotplug.h> 11 #include <linux/cpumask.h> 12 #include <linux/errno.h> 13 #include <linux/export.h> 14 #include <linux/hashtable.h> 15 #include <linux/module.h> 16 #include <linux/mutex.h> 17 #include <linux/overflow.h> 18 #include <linux/slab.h> 19 #include <linux/topology.h> 20 #include <linux/types.h> 21 22 #include <asm/cpu_device_id.h> 23 #include <asm/intel-family.h> 24 #include <asm/msr.h> 25 26 #include "tpmi_power_domains.h" 27 28 #define MSR_PM_LOGICAL_ID 0x54 29 30 /* 31 * Struct of MSR 0x54 32 * [15:11] PM_DOMAIN_ID 33 * [10:3] MODULE_ID (aka IDI_AGENT_ID) 34 * [2:0] LP_ID 35 * For Atom: 36 * [2] Always 0 37 * [1:0] core ID within module 38 * For Core 39 * [2:1] Always 0 40 * [0] thread ID 41 */ 42 43 #define LP_ID_MASK GENMASK_ULL(2, 0) 44 #define MODULE_ID_MASK GENMASK_ULL(10, 3) 45 #define PM_DOMAIN_ID_MASK GENMASK_ULL(15, 11) 46 47 /** 48 * struct tpmi_cpu_info - Mapping information for a CPU 49 * @hnode: Used to add mapping information to hash list 50 * @linux_cpu: Linux CPU number 51 * @pkg_id: Package ID of this CPU 52 * @punit_thread_id: Punit thread id of this CPU 53 * @punit_core_id: Punit core id 54 * @punit_domain_id: Power domain id from Punit 55 * 56 * Structure to store mapping information for a Linux CPU 57 * to a Punit core, thread and power domain. 58 */ 59 struct tpmi_cpu_info { 60 struct hlist_node hnode; 61 int linux_cpu; 62 u8 pkg_id; 63 u8 punit_thread_id; 64 u8 punit_core_id; 65 u8 punit_domain_id; 66 }; 67 68 static DEFINE_PER_CPU(struct tpmi_cpu_info, tpmi_cpu_info); 69 70 /* The dynamically assigned cpu hotplug state to free later */ 71 static enum cpuhp_state tpmi_hp_state __read_mostly; 72 73 #define MAX_POWER_DOMAINS 8 74 75 static cpumask_t *tpmi_power_domain_mask; 76 77 /* Lock to protect tpmi_power_domain_mask and tpmi_cpu_hash */ 78 static DEFINE_MUTEX(tpmi_lock); 79 80 static const struct x86_cpu_id tpmi_cpu_ids[] = { 81 X86_MATCH_VFM(INTEL_GRANITERAPIDS_X, NULL), 82 X86_MATCH_VFM(INTEL_ATOM_CRESTMONT_X, NULL), 83 X86_MATCH_VFM(INTEL_ATOM_CRESTMONT, NULL), 84 X86_MATCH_VFM(INTEL_GRANITERAPIDS_D, NULL), 85 X86_MATCH_VFM(INTEL_PANTHERCOVE_X, NULL), 86 {} 87 }; 88 MODULE_DEVICE_TABLE(x86cpu, tpmi_cpu_ids); 89 90 static DECLARE_HASHTABLE(tpmi_cpu_hash, 8); 91 92 static bool tpmi_domain_is_valid(struct tpmi_cpu_info *info) 93 { 94 return info->pkg_id < topology_max_packages() && 95 info->punit_domain_id < MAX_POWER_DOMAINS; 96 } 97 98 int tpmi_get_linux_cpu_number(int package_id, int domain_id, int punit_core_id) 99 { 100 struct tpmi_cpu_info *info; 101 int ret = -EINVAL; 102 103 guard(mutex)(&tpmi_lock); 104 hash_for_each_possible(tpmi_cpu_hash, info, hnode, punit_core_id) { 105 if (info->punit_domain_id == domain_id && info->pkg_id == package_id) { 106 ret = info->linux_cpu; 107 break; 108 } 109 } 110 111 return ret; 112 } 113 EXPORT_SYMBOL_NS_GPL(tpmi_get_linux_cpu_number, INTEL_TPMI_POWER_DOMAIN); 114 115 int tpmi_get_punit_core_number(int cpu_no) 116 { 117 if (cpu_no >= num_possible_cpus()) 118 return -EINVAL; 119 120 return per_cpu(tpmi_cpu_info, cpu_no).punit_core_id; 121 } 122 EXPORT_SYMBOL_NS_GPL(tpmi_get_punit_core_number, INTEL_TPMI_POWER_DOMAIN); 123 124 int tpmi_get_power_domain_id(int cpu_no) 125 { 126 if (cpu_no >= num_possible_cpus()) 127 return -EINVAL; 128 129 return per_cpu(tpmi_cpu_info, cpu_no).punit_domain_id; 130 } 131 EXPORT_SYMBOL_NS_GPL(tpmi_get_power_domain_id, INTEL_TPMI_POWER_DOMAIN); 132 133 cpumask_t *tpmi_get_power_domain_mask(int cpu_no) 134 { 135 struct tpmi_cpu_info *info; 136 cpumask_t *mask; 137 int index; 138 139 if (cpu_no >= num_possible_cpus()) 140 return NULL; 141 142 info = &per_cpu(tpmi_cpu_info, cpu_no); 143 if (!tpmi_domain_is_valid(info)) 144 return NULL; 145 146 index = info->pkg_id * MAX_POWER_DOMAINS + info->punit_domain_id; 147 guard(mutex)(&tpmi_lock); 148 mask = &tpmi_power_domain_mask[index]; 149 150 return mask; 151 } 152 EXPORT_SYMBOL_NS_GPL(tpmi_get_power_domain_mask, INTEL_TPMI_POWER_DOMAIN); 153 154 static int tpmi_get_logical_id(unsigned int cpu, struct tpmi_cpu_info *info) 155 { 156 u64 data; 157 int ret; 158 159 ret = rdmsrl_safe(MSR_PM_LOGICAL_ID, &data); 160 if (ret) 161 return ret; 162 163 info->punit_domain_id = FIELD_GET(PM_DOMAIN_ID_MASK, data); 164 if (info->punit_domain_id >= MAX_POWER_DOMAINS) 165 return -EINVAL; 166 167 info->punit_thread_id = FIELD_GET(LP_ID_MASK, data); 168 info->punit_core_id = FIELD_GET(MODULE_ID_MASK, data); 169 info->pkg_id = topology_physical_package_id(cpu); 170 info->linux_cpu = cpu; 171 172 return 0; 173 } 174 175 static int tpmi_cpu_online(unsigned int cpu) 176 { 177 struct tpmi_cpu_info *info = &per_cpu(tpmi_cpu_info, cpu); 178 int ret, index; 179 180 /* Don't fail CPU online for some bad mapping of CPUs */ 181 ret = tpmi_get_logical_id(cpu, info); 182 if (ret) 183 return 0; 184 185 index = info->pkg_id * MAX_POWER_DOMAINS + info->punit_domain_id; 186 187 guard(mutex)(&tpmi_lock); 188 cpumask_set_cpu(cpu, &tpmi_power_domain_mask[index]); 189 hash_add(tpmi_cpu_hash, &info->hnode, info->punit_core_id); 190 191 return 0; 192 } 193 194 static int __init tpmi_init(void) 195 { 196 const struct x86_cpu_id *id; 197 u64 data; 198 int ret; 199 200 id = x86_match_cpu(tpmi_cpu_ids); 201 if (!id) 202 return -ENODEV; 203 204 /* Check for MSR 0x54 presence */ 205 ret = rdmsrl_safe(MSR_PM_LOGICAL_ID, &data); 206 if (ret) 207 return ret; 208 209 tpmi_power_domain_mask = kcalloc(size_mul(topology_max_packages(), MAX_POWER_DOMAINS), 210 sizeof(*tpmi_power_domain_mask), GFP_KERNEL); 211 if (!tpmi_power_domain_mask) 212 return -ENOMEM; 213 214 ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, 215 "platform/x86/tpmi_power_domains:online", 216 tpmi_cpu_online, NULL); 217 if (ret < 0) { 218 kfree(tpmi_power_domain_mask); 219 return ret; 220 } 221 222 tpmi_hp_state = ret; 223 224 return 0; 225 } 226 module_init(tpmi_init) 227 228 static void __exit tpmi_exit(void) 229 { 230 cpuhp_remove_state(tpmi_hp_state); 231 kfree(tpmi_power_domain_mask); 232 } 233 module_exit(tpmi_exit) 234 235 MODULE_DESCRIPTION("TPMI Power Domains Mapping"); 236 MODULE_LICENSE("GPL"); 237